Those were commoner Ancient Egyptians, not Greek elites. The best portraits available (Fayum mummy portraits) besides the busts of the pharaohs.
The Egyptian population hasn't changed over all those thousands of years.
The only major impact that happened was additional Sub-Saharan African admixture being brought to Egypt in modern times through the Trans-Saharan Slave Trade facilitated by the domestication of the camel and Berber/Arab traders (uh traitors).
Europeans dominated Egypt since Alexander the Great conquered it. The city of Alexandria and its landmarks are a testament to their legacy in Egypt.
I'm not saying Egyptians were black but they were browner than a Mediterranean.
Case in point.
Cleopatra, Plotemaic Greek ruler of Ancient Egypt:
Rameses II, Egyptian ruler: